Optional values

Collaboration diagram for Optional values:

Classes
struct	std::experimental::fundamentals_v1::in_place_t
class	std::experimental::fundamentals_v1::optional< _Tp >

Macros
#define	__cpp_lib_experimental_optional

Variables
constexpr in_place_t	std::experimental::in_place
constexpr nullopt_t	std::experimental::nullopt

Detailed Description

Class template for optional values and surrounding facilities, as described in n3793 "A proposal to add a utility class to represent optional objects (Revision 5)".

Variable Documentation

in_place

constexpr in_place_t std::experimental::fundamentals_v1::in_place

constexpr

Tag for in-place construction.

Definition at line 77 of file experimental/optional.

nullopt

constexpr nullopt_t std::experimental::fundamentals_v1::nullopt

constexpr

Tag to disengage optional objects.

Definition at line 96 of file experimental/optional.